Doug Dotson wrote:
I am assembling my posihing system. Not clear whether it is better
to put the pump on the pressure side or the vacuum side. Having no
filter on the intake of the pump seems risky. I am using a 2 stage
approach. maybe putting the filter between the filters is an option.

You want to avoid having the pump act as an homogenizer. If
the pump takes suction directly from the tank it will
thoroughly mix all the water and crud that you want to
filter out. This makes it much more difficult to remove in
the filters.

The Racors operate best on the suction side because the
separator section of the filter will, when it receives one,
deposit a clean slug of water in the bowl rather than clog
the filter media with an emulsion created by the pump.

Rick